<template>
	<div class="component-upload-image">
		<el-upload
		  :action="uploadImgUrl"
		  list-type="picture-card"
		  :on-success="handleUploadSuccess"
		  :before-upload="handleBeforeUpload"
		  :limit="limit"
		  :on-error="handleUploadError"
		  :on-exceed="handleExceed"
		  name="file"
		  :on-remove="handleRemove"
		  :show-file-list="true"
		  :headers="headers"
		  :file-list="real_fileList"
		  :on-preview="handlePictureCardPreview"
		  :class="{ hide: real_fileList.length >= limit }"
    >
      <el-icon class="avatar-uploader-icon"><plus /></el-icon>
		</el-upload>
		<!-- 上传提示 -->
		<div class="el-upload__tip" v-if="showTip">
			请上传
			<template v-if="fileSize">
				大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
			</template>
			<template v-if="fileType">
				格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
			</template>
			的文件
		</div>

		<el-dialog
		 v-model="dialogVisible"
		 title="预览"
		 width="800px"
		 append-to-body
		>
		 <img
 		  :src="dialogImageUrl"
		  style="display: block; max-width: 100%; margin: 0 auto"
		  />
		</el-dialog>
	</div>
</template>

<script setup>
import { getToken } from "@/utils/auth";

const props = defineProps({
	modelValue: [String, Object, Array],
	// 图片数量限制
	limit: {
		type: Number,
		default: 5,
	},
	// 大小限制(MB)
	fileSize: {
		type: Number,
		default: 5,
	},
	// 文件类型, 例如['png', 'jpg', 'jpeg']
	fileType: {
		type: Array,
		default: () => ["png", "jpg", "jpeg"],
	},
	// 是否显示提示
	isShowTip: {
		type: Boolean,
		default: true
	},
});

const { proxy } = getCurrentInstance();
const emit = defineEmits();
const dialogImageUrl = ref("");
const dialogVisible = ref(false);
const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadImgUrl = ref(import.meta.env.VITE_APP_BASE_API + "/api/files/upload"); // 上传的图片服务器地址
const headers = ref({ Authorization: "Bearer " + getToken() });
const real_fileList = ref([]);
const fileList = ref([]);
const showTip = computed(
	() => props.isShowTip && (props.fileType || props.fileSize)
);

watch(() => props.modelValue, val => {
	if (val) {
		// 首先将值转为数组
		const list = Array.isArray(val) ? val : props.modelValue.split(",");
		// 然后将数组转为对象数组
		fileList.value = list.map(item => {
			if (typeof item === "string") {
				if (item.indexOf(baseUrl) === -1) {
					item = { name: baseUrl + '/' + item, url: baseUrl + '/' + item };
				} else {
					item = { name: item, url: item };
				}
			}
			return item;
		});
		real_fileList.value = [...fileList.value]

	} else {
		fileList.value = [];
		real_fileList.value = [];
		return [];
	}
});

// 删除图片
function handleRemove(file, files) {
	const findex = fileList.value.map(f => f.name).indexOf(file.name);
	if (findex > -1) {
		fileList.value.splice(findex, 1);
		emit("update:modelValue", listToString(fileList.value));
	}
}

// 上传成功回调
function handleUploadSuccess(res) {
	fileList.value.push({ name: res.ResData.FileName, url: res.ResData.FilePath });
	emit("update:modelValue", listToString(fileList.value));
	proxy.$modal.closeLoading();
}

// 上传前loading加载
function handleBeforeUpload(file) {
	let isImg = false;
	if (props.fileType.length) {
		let fileExtension = "";
		if (file.name.lastIndexOf(".") > -1) {
			fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
		}
		isImg = props.fileType.some(type => {
			if (file.type.indexOf(type) > -1) return true;
			if (fileExtension && fileExtension.indexOf(type) > -1) return true;
			return false;
		});
	} else {
		isImg = file.type.indexOf("image") > -1;
	}
	if (!isImg) {
		proxy.$modal.msgError(
			`文件格式不正确, 请上传${props.fileType.join("/")}图片格式文件!`
		);
		return false;
	}
	if (props.fileSize) {
		const isLt = file.size / 1024 / 1024 < props.fileSize;
		if (!isLt) {
			proxy.$modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
			return false;
		}
	}
	proxy.$modal.loading("上传中");
}

// 文件个数超出
function handleExceed() {
	proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

// 上传失败
function handleUploadError() {
	proxy.$modal.msgError("上传失败");
	proxy.$modal.closeLoading();
}

// 预览
function handlePictureCardPreview(file) {
	dialogImageUrl.value = file.url;
	dialogVisible.value = true;
}

// 对象转成指定字符串分隔
function listToString(list, separator) {
	let strs = "";
	separator = separator || ",";
	for (let i in list) {
		strs += list[i].url.replace(baseUrl, "") + separator;
	}
	return strs != "" ? strs.substr(0, strs.length - 1) : "";
}
</script>

<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
:deep(.hide .el-upload--picture-card) {
	display: none;
}

// 去掉动画效果
:deep(.el-list-enter-active),
:deep(.el-list-leave-active) {
	transition: all 0s;
}

:deep(.el-list-enter, .el-list-leave-active) {
	opacity: 0;
	transform: translateY(0);
}
</style>